As the number of carbon atoms in a molecular formula increases, the number of possible isomers a. increases rapidly.
b. decreases.
c. increases slowly.
d. remains the same.

They are all full and don't need any more electrons in there outer shell.

Ithink 2 is the correct

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water